Watch-maker s chuck



(No Model.)

J. SPICKERMAN.

WATCH MAKER'S CHUCK. No. 255.470. Patented Mar. 28,1882

WITNESESS INVENTUR= f Cw@ mw UNITEDY lSTATES PATENT OFFICE.

JOHN sEIOKEaMAN, OE JEFFERSON, NEW YORK.

WATCH-MAKERS CHUCK.

SPECIFICATION formingpart of Letters Patent No. 255,470, dated March 28, 1882.

Application filed January 13, 1882.

To all whom it may concern Be it known that I, JOHN SPIOKERMAN, of Jeli'erson, in the county of Scholiarie and State ot' New York, have invented an Improved Chuck for Jewelers7 Lathes; and I do hereby declare that the followingis a full, clear, and exact description ot' the invention, whichwill enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings,and to the lettersof reference marked thereon, which form a part of this specitication.

rlhe object of my invention is to produce a convenient, effective, and accurate chuck for holding watch-wheels, to be attached to jewelers lathes, and centering them therein, while putting in new pivots or polishing pivots already in the work when they have become rusty or rough.

The invention is intended as asubstitute for the usual means of securing watch-wheels to lathes by wax.

Figure lis a side view of the holder part of the chuck to be secured to the lathe; Fig. 2, a side view of the body ot' the clamp part, which holds the watch-wheel; Fig. 3, a central section, showing the inner side of the olamp'cap used for small watch-wheels; Fig. 4, a top view of the clamp cap or plate used for large watch-wheels; Fig. 5, a central axial section of all the parts united in place, showing also a watch-wheel held therein; Fig. 6, a top or face view, showing a large wheel secured to the chuck.

Like letters designate corresponding parts in all of the tigures.

rlhe part A, Fig. l, which I term the holder, has a plane face, a, and a screw-shank, b, or equivalent means for securing to the mandrel of the jewelers7 lathe.

The body B, Fig. 2, of the clamp to which the watch-wheel is secured has a rear plane surface, c, which is to be placed in contact with and temporarily secured to the holder A by wax or equivalent adhesive substance. Upon the periphery of its head d is formed a screw-thread,f, Fig. 2, by which a clamp-cap, C, Figs. 3 and 5, is secured upon the body, the rim g of the said cap of course having an in 5e terior screwthread to t the screw-threadf.

(No model.)

In the center of the head d of the body B is a hole, h, and in the center of the cap Gis also a hole, z', these holes being designed to admit the pivot and pinion of the watch-wheel 7c, Fig. 5, loosely therein. All wateh-wheels not too large to be admitted into the cap C are clamped by simply placing in the said cap, which is then screwed upon the body B till the watch-wheel is tightly held between the two, and in a 'nearly central position. In cases where the watch-wheel (as a balance-wheel, for instance) is too large to be admitted into the inclosing-cap C without making the whole clamp undesirably large I employ a simple vsmall clamp-plate, C', Figs. 4 and 6, large enough to cover the hub part Ot' the watchwheel, and admit three or more screws, l l l, between the spokes of the watch-wheel, these screws screwing into correspondin g screw-holes in the face ofthe body B. This cap-plate has va central hole, e', like the cap C, for the same purpose, and the two caps fulfill the same function, only differing in the mode ot attachment to the body B. vrlhe watch-wheel having been clamped to the bodyB in nearly a central position, requiring no vexactness, this body is temporarily secured to the holder A, previously attached to the lathe-mandrel, by using a little melted wax or suitable adhesive substance which hardens when cold, and pressing the rear surface, c, of the` clamp to the face a of the holder A, with the wax between, and revolving the lathe, while the clamp is held by pressing a piece ot' wood, iron, or other substance against the projecting end of the watoh wheel pivot in the clamp, the clamp plate or cap being thin, so as to allow this projection of the pivot. This perfectly centers the watchwheel by its own pivot, the revolution of the lathe continuing till the wax cools, and the clamp is set in a central position. By this device the watch-wheel is kept clean, is not discolored by heating, and is perfectly protected from injury while replacing or polishing the pivot. The method is also expeditious and accurate. e

The entire chuck is made of brass, iron, or other suitable metal, and, beingsmall and capa-v ble of being made very thin and light, is not unwieldy, and is very easy to manage. It is adapted to receive all sizes of Watch-wheels parts B G constructed and operating substanro and wheels for other fine work. lcially as and for the purpose herein specified. What I claim as my invention, and desire In testimony that I claim the foregoing as to secure by Letters Patent, ise my own I aix my signature in presence of two 1. A chuck forjewelers lathes, composed of witnesses. the holderA and clamp B G, arranged und op- JOHN SPIGKERMAN. erat'ing hsubstantially as and for thepurpose Witnesses: herein specified. W. E. STANLEY, 2. The Watch-wheel clamp composed of the J. H. HUBBARD. 

